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The passenger door has stopped unlocking with the remote and the central button - I have to unlock the door by manually opening the handle from inside.

Having read a lot of the posts on here it seems to clearly point to either the Door Lock Actuator or the GM5. I am struggling to determine which though. Is there a simple test to see which is more likely?

When pressing the remote fob there is a mechanical sound by the passenger lock but nothing happens.

Hmmm. Just tried to open the drivers door and the fob wasn't working for that either. Opened it by key and now working again. Maybe it is the GM5 then.... I'll try and contact Scottjon - thanks for the info